I think this issue was raised in another thread. But anyway, I do not think there are any other marque match ups in the first round and with all of the attention Martina has generated with her comeback, I expect her to debut here in Rod Laver arena in the featured match on her day. Vera is not a nobody herself, so that will help, too.
Incidentally, there has apparently been a tremendous interest in betting on her since the announcement of her comeback, with odds for hew now down to about 20 or 21 to one. There is an article about all the punters rushing to get money down on her, which has lowered the odds on her considerably.
I think Hingis will be on center court and probably get a huge reception from the fans when she makes her initial appearance.